Mounting assembly for a convergence coil

ABSTRACT

A convergence coil assembly primarily for use with multigun cathode ray tubes and for mounting on a printed circuit board in which resilient mounting posts permit radial movement of the convergence coil assembly but limits skew and axial movement. A compact, economical supporting structure is shown, as well as a unique means for containing a shorting bar and for retaining the permanent magnet which is used for static convergence adjustment.

United States Patent Bussey et al.

[ 1 Nov. 12, 1974 MOUNTING ASSEMBLY FOR A CONVERGENCE COIL Inventors:Robert William Bussey, Crystal Lake; John Glenn Powers, Wilmette, bothof 111.

Assignee: TRW, Ine., Elk Grove Village, 111.

Filed: Feb. 1, 1974 Appl. No.: 438,757

US. Cl 335/210, 317/101 CC Int. Cl. H011 7/00 Field of Search 335/210,212, 213; 313/75,

313/76; 317/101 C, 101 CC References Cited UNITED STATES PATENTS 6/1965Patti 335/213 X 4/1968 McLeod 335/210 X 2/1970 Harten et a1 335/2123,617,963 11/1971 DeBoth et a1 1.

3,623,151 11/1971 lkcuchi 335/217 X 3,629,752 12/1971 Anthony 335/2123,717,788 2/1973 Rogers .1 335/212 3,794,946 2/1974 Brown 335/217 XPrimary Examiner-G. Harris Attorney, Agent, or FirmLawrence S. Cohen[57] ABSTRACT A convergence coil assembly primarily for use with muhiguncathode ray tubes and for mounting on a printed circuit board in whichresilient mounting posts permit radial movement of the convergence coilassembly but limits skew and axial movement. A compact, economicalsupporting structure is shown, as well as a unique means for containinga shorting bar and for retaining the permanent magnet which is used forstatic convergence adjustment.

14 Claims, 5 Drawing Figures SHEEF 2 0f 4 PATENIE NOV 1 21974 FIG. 2

PATENTEL Riv/121914 3.848.207

SHEET 30F 4 FIG. 3

MOUNTING ASSEMBLY FOR A CONVERGENCE COIL BACKGROUND OF THE INVENTION 1.Field of the Invention This invention relates to convergence coilassemblies for cathode ray tubes. It especially relates to suchassemblies used on multigun cathode ray tubes such as commonly used incolor television tubes. In particular, the invention relates to suchassemblies as are used with and mounted on a printed circuit boardcontaining associated circuitry.

2. Description of the Prior Art Color television picture tubes of thetype employing a shadow mask are provided with convergence circuits bymeans of which the three electron beams in a delta array are caused topass through the same hole in the shadow mask at the same time. Thus,the beams must converge at the shadow mask at all points scanned by thebeam. When the beams do this, they emerge from the mask at the correctangle to strike the appropriate dot in the triad of color dots on theface of the tube. Normally static as well as dynamic convergenceadjustment is required, and to achieve such convergence, it is thepractice to subject the beams to auxiliary magnetic fields. Staticconvergence, that is, adjustment of the beam convergence at a fixedpoint, usually the center of the screen, is accomplished by a permanentmagnet means which bends the individual beam to convergence.Conventionally, an adjustably supported permanent magnet is used forstatic adjustment. Dynamic convergence, that is, maintaining the beamsin proper convergence during scanning, is accomplished byelectromagnetic apparatus. These electromagnets are energized bycorrection signals derived from horizontal and vertical deflectioncircuits.

Both the permanent magnet and the electromagnets apply their flux topole piece pairs which are mounted inside the neck of the cathode raytube. A separate pole piece pair and a separate convergence assembly isassociated with each beam in the cathode ray tube. The pole piece pairstypically take the form of elongated members that flank the path of itsassigned electron beam to direct the magnetic flux field which isproduced between the pole piece pairs across the path of the beam.

It is also desirable to provide some means of temperature compensationin a convergence assembly. This is due to changes in flux density,especially those changes associated with the permanent magnet, as aresult of changes in ambient temperature.

The prior art has numerous examples of convergence assemblies which havebeen used to secure static and dynamic convergence.

Convergence coil assemblies of the prior art are described in thefollowing U.S. patents which are cited strictly for the purpose ofillustration and are not exhaustive of the subject matter:

The typical convergence coil assembly has a pair of L-shaped core piecesassembled in a U formation with windings for the vertical and horizontalconvergence on each of the parallel legs of the U formation. The

abutting legs of the U formation forming the bight of the U have anon-magnetic gap across which the flux of the permanent magnet isapplied. The U formation and its windings and the permanent magnet areassembled in a housing usually of plastic.

With the increasing use of printed circuit boards, it has become commonto mount the associated vertical and horizontal convergence controlcircuitry on a printed circuit board shaped to fit around the neck ofthe cathode ray tube. The convergence coil assemblies are also mountedon the printed circuit board at the angle to each other consistent withthe disposition of the electron beams and their pole piece pairs on theneck of the cathode ray tube. The convergence coil assemblies as theyare installed with the printed circuit board on the neck of the tubemust have their parallel legs of the L-shaped cores aligned with theircooperating pole pieces. The ends of the parallel legs of the cores arecanted to fit the curvature of the neck. It is important that the endsof the parallel legs be in contact with the glass of the tube neck inorder to minimize the space between the L-shaped cores and theirrespective pole pieces inside the neck. In this respect, it should alsobe noted that the diameter of the tube neck varies from one tube toanother and therefore the convergence assembly must be able to moveradially to accommodate such difference. In considering this, it hasbeen a problem to mount the convergence assembly on the printed circuitboard in such manner as to permit such radial movement while closelylimiting skew type movement, that is, movement out of the correctangularorientation with the pole piece pairs. In addition, it is important thatthe convergence coil assembly remain in firm contact with the printedcircuit board in order to closely control its axial position on the neckof the cathode ray tube.

In a further adaptation, a shorting bar is applied around the L-shapedcores. The shorting bar is required because the convergence coilassembly is usually in proximity to the deflection assembly and its highmagnetic field. The shorting bar serves to protect the convergenceassembly from undesired effects of the deflection magnetic field.

As is commonly the case, the cost and size are important considerationsin all factors of design of the convergence assembly. The inventiondescribed and claimed below provides in a small economical package aconvergence assembly providing for accurate and stable emplacement andfunctioning.

SUMMARY OF THE INVENTION A convergence coil assembly includingelectromagnetic dynamic convergence means and permanent magnet staticconvergence means, a supporting structure, and mounting means in which afirst mounting lug pair close to the point of application to a cathoderay tube neck permits radial and skew movement and prohibits liftingfrom a printed circuit board and a second mounting lug pair radiallydistant from the point of application to the tube neck with respect tothe first mounting pair permits radial movement and prohibits skewmovement.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I An assembled view showingconvergence assemblies of the invention on a printed circuit board andmounted on a cathode ray tube neck.

FIG. 3 A sectional side view of the convergence assembly of theinvention on line III'lIIof FIG. 2.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1,convergence coil assemblies 1 are shown in an orientation 120 apart andmounted upon a printed circuit board 2. While the details of the printedcircuit board and the circuit components mounted'on it arerepresentative of one in actual use, no further explanation of thesedetails will be given. This is because such additional details would notenhance' understanding of the following description. It is sufficient tounderstand that the elements illustrated are those comprising thecircuitry of the vertical and horizontal convergence control circuits inconjunction with the respective vertical and horizontal convergencecontrol windings. Normally, the convergence assembly 1 will be providedwith protective tape 3 around the windings as shown on two of theassemblies. The tape 3 has been omittedfrom one of the assemblies toshow the details of the assemblies. The L-shaped core pieces 4 arearranged in a U formation well illustrated in the sectional view of FIG.2. The core pieces 4 have parallel legs 5 forming the sides of the Uformation, and abutting legs 6 forming the bight of the U. Although theterm abutting is used here for descriptive purposes, it should beunderstood that these legs 6 terminate leaving a gap. The legs 5terminate with canted ends 7 in order to fit the curvature of the neck 8of the cathode ray tube. The legs 5 are generally parallel and spaced sothat when the assembly is in place on the neck 8 of the tube, they willoperatively align with pole piece pairs 9 which flank the electron beams10.

Referring to FIGS. 2 and 3, it can be seen that two sets of windings areoperatively applied to the core pieces 4. For horizontal convergencecontrol, the inside or horizontal winding 11 is on the horizontal bobbin12. For vertical convergence control the outside or vertical winding 13is on a vertical bobbin 14.

With the upper flange l5 and the lower flange 16 and the spring clip 17,the horizontal bobbin 12 and the vertical bobbin l4 constitutes thesupporting structure of the convergence assembly.

In the gap between the abutting legs 6 is a metallic temperaturecompensating element 18 which is described in detail in U.S. Pat. No.3,590,302 issued on June 29, 1971 to Robert W. Bussey. A piece of tape19 may be emplaced in the gap to act as a dielectric and therebyseparate the faces of the L-core.

Mounted above the legs 6 is a permanent magnet 20 in the form ofa disc.This element is similar in function and form to those previously knownin the art. It is adapted to rotate on an axis radial to the tube neck 8to adjust the magnetic flux delivered to the pole piece pair 9. Thepermanent magnet 20 adjusts static convergence.

The permanent magnet 20 is rotatably held in place on the legs 6 by thespring clip 17 shown in FIGS. 2 and 4. The spring clip 17 is made bypunching and forming a metal, such as phosphor bronze, spring tempered,to

. 4' provide the required retaining forces. A central bearing surface 21has a dimple 22 which resides inside a hole 23 centered in the permanentmagnet 20. From opposite sides of the bearing surface 21 legs 24 extendoutwardly and downwardly at an angle to clear the permanent magnet 20.The legs 24 then turn downwardly to a terminal portion having shoulders25. The shoulders 25 are held in upstanding retaining clips 26 extendingfrom the upper flange 15. The terminal portions also push on theoutboard ends of the abutting legs 6, exerting an inward force on them.The retaining clip 26 allows some sliding of the shoulders in order tofacilitate the inward force.

Now referring to FIGS. 4 and 5, a first pair of mounting lugs 27 arefitted to the lower flange 16. A second pair of mounting lugs 28 arefitted to the upper flange 15. For convenience, the first pair ofmounting lugs 27 may be referred to as the lower lugs or as beingproximate to the tube neck 8. Also, the second pair of mounting lugs 28may be referred to as the upper lugs or as being distant from the tubeneck 8.

Before describing the-lugs and their operation in detail, some furtherexplanation of the entire assembly will be helpful. When installed, theprinted circuit board 1 resides in a radial plane relative to the tubeneck 8 and the generally parallel core legs 5 are parallel to a radialline extending from the tube neck 8 normal to its axis A and midwaybetween the pole piece pairs 9.

Thus, in this description, radial movement refers to movement along theradial line as at B in FIGS. 1 and 2. Skew movement refers to movementto the left or right (as seen in FIG. 1 of the upper assembly) of theradial line as at C in FIGS. 1 and 2. This movement may take placecircumferentially around the tube neck 8, that is, it may be arcuatemovement.

Radial movement is desired because the tube necks are manufactured witha certain amount of tolerance. Typically, a tube neck will have anominal diameter of 1 7/16 inch i l/l6 inch. Thus, in order to assure anintimate contact between the canted core feet ends 7 and the tube neck8, the coil assemblies are made to mount on the printed circuit board tofit the smallest diameter, 1% inch. For larger diameters, theconvergence coil assembly herein described is able to move radiallyoutward. The mounting lugs 27 and 28 described in detail below providethis radial movement.

Some slight skew movement of the converging assembly is in fact desiredclose to the tube neck 8 in order to provide good seating of the cantedcore feet 7 on the tube neck 8. However, skew movement radially outboardof the tube neck 8, such as at the upper lugs 28 can result inmisalignment of the L core legs 5 and the-pole piece pairs 9, to adegree that can adversely affect operation. Thus, the lower lugs 27permit some skew movement but the upper lugs 28 prohibit skew movement.

In addition to radial and skew movement, upon assembly and adjustment ofthe printed circuit board 2 to the tube neck 8, there is a force tendingto pull the convergence assembly away from the printed circuit board dueto drag of the core feet 7 on the tube neck 8. The lower mounting lugs27 described herein prohibit such movement.

Having thus described the preferred embodiment of the mounting lugs,there follows an additionally de- 1 tailed description.

Referring to FIGS; 2, 4 and 5 the upper and lower flanges l5 and 16 aresimilarly made having a rectangu- Iar perimeter with small rectanglesremoved at the corners 29. A slot 30 extends along the short edges ofthe flanges and continues around the corners extending only a shortdistance along the long edge. The lower lugs 27 fit in the slot 30 asshown in FIG. 5 and the upper lugs 28 fit in the slot 30 as shown inFIG. 4.

When so assembled, the lower lugs 27 extend outof the ends of the lowerflange 16 about midway defining a pivot point 31 and then have a flexingportion 32 which extends parallel to the tube neck axis A, beyond theflange and terminate in a termination portion 33 which is received andheld in the printed circuit board 2. The pivot point 31 allows the lugs27 to flex when the coil assembly is moved in the radial direction,without interfering with the flange 16. The pivot point 31 is selectedto space the lugs slightly from the side of the flange 16 and also topermit some skew direction flexing of the lugs 27.

When so assembled, the upper lugs 28 have a flexing portion 34 extendingfrom the corner 29 of the flange l5 oppositely and outward in a radialplane relative to the tube neck 8 and normal to the tube axis A. It ispreferably also normal to the radial line B. A termination portion 35,constituting that part which is received and held in the printed circuitboard 1 is normal to the first portion and parallel to the tube axis A.The slot 30 is enlarged at 36 (FIG. 2) in order to permit flexing of thefirst portion during radial movement of the convergence assembly. Theflexing portion 34 has a pivot point 37 from which the radial flexingcommences.

However, the termination portion 35 having no substantial free lengthpermits substantially no skew movement.

The upper and lower lugs are preferably formed from a highly resilientwire for example 0.020 inch diameter steel music wire. They may besecured to the flanges, which may be made of thermoplastic material byheating selected portions of the plastic to flow and close the slots 30.

As thus described, comparing the lugs 27 and 28, the

lower lug 27 has a relatively long flexing portion 32,

e.g., about one quarter inch, for radial and skew movement, while theupper lug 28 has relatively much less flexing capability for skewmotion, in fact substantially none, i.e., the termination portion 35.For the upper lug 28, the flexing portion 34 is about the same length,e.g., about one quarter inch as the flexing portion 32, providing aboutthe same capability for radial movement. Furthermore, the lower lug 27has substantially no portion permitting axial movement, while the upperlug 28 has in its flexing portion 34 some capability for axial movement.This latter is of no effect because the axial force from the drag of thecore ends 7 is not transmitted to the upper lugs.

The lugs 27 and 28, in addition to their mounting function, preferablyalso serve as termination for the vertical and horizontal windings. Toaccomplish this each lug has a wire receiving portion 38 constitutingits passive end, which extends oppositely outward from far corners ofthe flanges l6 and 17. The vertical windings 13 are terminated to theupper lugs 28. The horizontal windings 11 are similarly terminated tothe lower lugs 27, the winding wire in this case running through slots39 in the lower flange 16. The respective windings on fects from otherelements of the television receiver circuitry particularly the highmagnetic field of the deflection coil which is positioned nearby. Inthis preferred embodiment, the vertical bobbins 14 are ultimately joinedtogether fully enclosing the shorting bar 40. In

the assembly operation the shorting bar and the vertical bobbin 14 withits winding 13 already on it, are assembled to each other and in a laterstep, the L cores 4 are inserted into the vertical bobbins l4 and thenthe horizontal bobbins 12 are installed. Thereafter the permanent magnet20 and the spring clips.17 are assembled. By the manner and means forretaining the shorting bar its position with respect to the windings issimply and effectively assured.

While the above description relates to certain embodiments now known toand preferred by the inventors, it is possible for persons skilled inthe art to make certain additions, changes and modifications. It isintended by the appended claims to cover such additions, changes andmodifications as fall within the scope and spirit of the invention.

We claim:

1. A convergence assembly for use with a cathode ray tube and formounting on a printed circuit board comprising;

a supporting structure having a lower portion for mounting proximate toa cathode ray tube neck and an upper portion for mounting radiallydistant from a cathode ray tube neck,

magnetic flux producing means contained by the supporting structure,

mounting means including a lower mounting lug pair extending from thelower portion of the supporting means which is resilient in the radialand skew directions and substantially rigid in the axial direction of acathode ray tube neck and having a mounting portion for inserting into aprinted circuit board, and

an upper mounting lug pair extending from the upper portion of thesupporting means which is resilient in the radial direction of a cathoderay tube neck and having a mounting portion for inserting into a printedcircuit board,

whereby upon assembly to a cathode ray tube neck the convergenceassembly being mounted on a printed circuit board will be slightlymovable with respect to the printed circuit board in the radialdirection and slightly movable in the skew direction only at its portionnear to the cathode ray tube and will be immovable in the axialdirection.

2. The convergence assembly of claim 1 wherein the upper mounting lugsfurther comprise;

a pair of resilient metal members each having a flexing portionextending in a radial plane outwardly from the supporting structure onopposite sides of and normal to the radial axis and adapted to besecured to a printed circuit board thereby permitting resilient movementof the assembly in the radial direction relative to the cathode raytube, by flexing of the flexing portions,

and the lower mounting lugs further comprise;

a pair of resilient metal members having a flexing portion extendinggenerally parallel to the axis of a cathode ray tube from the supportingstructure on opposite sides of and normal to the radial axis and adaptedto be secured to a printed circuit board'thereby permitting resilientmovement of the assembly in the radial and skew directions relative tothe cathode ray tube by flexing of the flexing portions. 3. Theconvergence assembly of claim 2 wherein the lugs are resilientconductive wire and are electrically connected to the magnetic fluxproducing means and the terminal end of each wire is bent back uponitself to provide a larger post to fit in a mounting hole in a printedcircuit-board.

4. The convergence assembly of claim 1 wherein the support structure hasa generally rectangular shape at its upper and lower portions and thelower mounting lugs extend from opposite shorter sides and the upperlugs extend from opposite corners thereof.

' 5. The convergence assembly of claim 1 wherein the mounting lugs areof a resilient conductive metal and are electrically connected to themagnetic flux producing means and have means for connecting them toconductors on a printed circuit board.

6. The convergence assembly of claim 1 wherein the magnetic fluxproducing means comprises;

L shaped core members assembled in a U formation having generallyparallel first legs extending for contact with the neck of a cathode raytube abutting second legs forming the bight of the U formation,

windings associated with the core members for supplying anelectromagnetic flux field to the cathode ray tube; and

bobbin means surrounding at least the parallel first legs of the Lshaped core members for supporting the core members and having thewindings there-' upon to induce the magnetic flux. I

7. The convergence assembly of claim 6 wherein the upper mounting lugsfurther comprise a pair of resilient metal members each having a flexingportion extending outwardly in a radial plane from the bobbin means onopposite sides of and'normal to the radial axis and adapted to besecured to aprinted circuit board thereby'permitting resilient movementof the assembly in the radial direction relative to the cathode raytube,

by flexing of the flexing portions, and the lower mounting lugs furthercomprise a pair of resilient metal members having a flexing portionextending generally parallel to the axis of a cathode ray tube from thebobbin means on opposite sides of and normal to the radial axis andadapted to be secured to a printed circuit board thereby permittingresilient movement of the assembly in the radial and skew directionsrelative to the cathode ray tube by flexing of the flexing portions.

8. The convergence assembly of claim 7 wherein the lugs are resilientconductive wire and are electrically connected to the magnetic fluxproducing means and the terminal end of each wire is bent backuponitself to provide a larger post to fit in a mounting hole in a printedcircuit board.

9. The convergence assembly of claim 1 further comprising a printedcircuit board to which the convergence assembly is mounted by means ofthe mounting lugs.

10. The convergence assembly of claim 8 further comprising a printedcircuit board to which the convergence assembly is mounted by means ofthe mounting lugs.

11. The convergence assembly of claim 7 wherein the support structurehas a generally rectangular shape at its upper and lower portions andthe lower mounting lugs extend from opposite shorter sides and the upperlugs extend from opposite corners thereof.

12. The convergence assembly ofclaim 8 wherein the bobbin meanscomprises a lower generally rectangular flange having a slot on eachoutboard side thereof for receiving and seating the lower mounting lugsrespectively therein and generally rectangular upper flange having aslot on each outboard side thereof for receiving and sealing the lowermounting lugs respectively therein.

13. The convergence assembly of claim 6 wherein the bobbin meanscomprises separate bobbin means on each parallel leg abutting centrallythereof and having a cavity in each upper flange portion which cavitiesmeet to form an enclosed cavity and the parallel legs pass through thecavity and also having a shorting bar situated inside the cavity andsurrounding the L core legs.

14. The convergence assembly of claim 13 wherein the bobbin meanscomprises a first bobbin means containing vertical windings and havingthe flanges thereon and second bobbin means containing horizontalwindings being assembled on the L core legs inside a portion of thefirst bobbin means.

1. A convergence assembly for use with a cathode ray tube and formounting on a printed circuit board comprising; a supporting structurehaving a lower portion for mounting proximate to a cathode ray tube neckand an upper portion for mounting radially distant from a cathode raytube neck, magnetic flux producing means contained by the supportingstructure, mounting means including a lower mounting lug pair extendingfrom the lower portion of the supporting means which is resilient in theradial and skew directions and substantially rigid in the axialdirection of a cathode ray tube neck and having a mounting portion forinserting into a printed circuit board, and an upper mounting lug pairextending from the upper portion of the supporting means which iSresilient in the radial direction of a cathode ray tube neck and havinga mounting portion for inserting into a printed circuit board, wherebyupon assembly to a cathode ray tube neck the convergence assembly beingmounted on a printed circuit board will be slightly movable with respectto the printed circuit board in the radial direction and slightlymovable in the skew direction only at its portion near to the cathoderay tube and will be immovable in the axial direction.
 2. Theconvergence assembly of claim 1 wherein the upper mounting lugs furthercomprise; a pair of resilient metal members each having a flexingportion extending in a radial plane outwardly from the supportingstructure on opposite sides of and normal to the radial axis and adaptedto be secured to a printed circuit board thereby permitting resilientmovement of the assembly in the radial direction relative to the cathoderay tube, by flexing of the flexing portions, and the lower mountinglugs further comprise; a pair of resilient metal members having aflexing portion extending generally parallel to the axis of a cathoderay tube from the supporting structure on opposite sides of and normalto the radial axis and adapted to be secured to a printed circuit boardthereby permitting resilient movement of the assembly in the radial andskew directions relative to the cathode ray tube by flexing of theflexing portions.
 3. The convergence assembly of claim 2 wherein thelugs are resilient conductive wire and are electrically connected to themagnetic flux producing means and the terminal end of each wire is bentback upon itself to provide a larger post to fit in a mounting hole in aprinted circuit board.
 4. The convergence assembly of claim 1 whereinthe support structure has a generally rectangular shape at its upper andlower portions and the lower mounting lugs extend from opposite shortersides and the upper lugs extend from opposite corners thereof.
 5. Theconvergence assembly of claim 1 wherein the mounting lugs are of aresilient conductive metal and are electrically connected to themagnetic flux producing means and have means for connecting them toconductors on a printed circuit board.
 6. The convergence assembly ofclaim 1 wherein the magnetic flux producing means comprises; L shapedcore members assembled in a U formation having generally parallel firstlegs extending for contact with the neck of a cathode ray tube abuttingsecond legs forming the bight of the U formation, windings associatedwith the core members for supplying an electromagnetic flux field to thecathode ray tube; and bobbin means surrounding at least the parallelfirst legs of the L shaped core members for supporting the core membersand having the windings thereupon to induce the magnetic flux.
 7. Theconvergence assembly of claim 6 wherein the upper mounting lugs furthercomprise a pair of resilient metal members each having a flexing portionextending outwardly in a radial plane from the bobbin means on oppositesides of and normal to the radial axis and adapted to be secured to aprinted circuit board thereby permitting resilient movement of theassembly in the radial direction relative to the cathode ray tube, byflexing of the flexing portions, and the lower mounting lugs furthercomprise a pair of resilient metal members having a flexing portionextending generally parallel to the axis of a cathode ray tube from thebobbin means on opposite sides of and normal to the radial axis andadapted to be secured to a printed circuit board thereby permittingresilient movement of the assembly in the radial and skew directionsrelative to the cathode ray tube by flexing of the flexing portions. 8.The convergence assembly of claim 7 wherein the lugs are resilientconductive wire and are electrically connected to the magnetic fluxproducing means and the terminal end of each wire is bent backuponitself to provide a larger post to fit in a mounting hole in a printedcircUit board.
 9. The convergence assembly of claim 1 further comprisinga printed circuit board to which the convergence assembly is mounted bymeans of the mounting lugs.
 10. The convergence assembly of claim 8further comprising a printed circuit board to which the convergenceassembly is mounted by means of the mounting lugs.
 11. The convergenceassembly of claim 7 wherein the support structure has a generallyrectangular shape at its upper and lower portions and the lower mountinglugs extend from opposite shorter sides and the upper lugs extend fromopposite corners thereof.
 12. The convergence assembly of claim 8wherein the bobbin means comprises a lower generally rectangular flangehaving a slot on each outboard side thereof for receiving and seatingthe lower mounting lugs respectively therein and generally rectangularupper flange having a slot on each outboard side thereof for receivingand sealing the lower mounting lugs respectively therein.
 13. Theconvergence assembly of claim 6 wherein the bobbin means comprisesseparate bobbin means on each parallel leg abutting centrally thereofand having a cavity in each upper flange portion which cavities meet toform an enclosed cavity and the parallel legs pass through the cavityand also having a shorting bar situated inside the cavity andsurrounding the L core legs.
 14. The convergence assembly of claim 13wherein the bobbin means comprises a first bobbin means containingvertical windings and having the flanges thereon and second bobbin meanscontaining horizontal windings being assembled on the L core legs insidea portion of the first bobbin means.